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Adhesive strength of self-adhesive resins to lithium disilicate ceramic and dentin: effect of dentin chelating agents

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Abstract

The aim of this study was to test the effect of different chelating agents on microtensile bond strength (MTBS) of self-adhesive resin cements to dentin. The occlusal surfaces of extracted human mandibular molars (N = 80) were cut horizontally to expose sound dentin. The teeth were randomly divided into four groups (n = 20 per group) and dentin surfaces were conditioned according to one of the following methods: group C: no treatment (control group); group CH: 0.2 % chitosan; group E: 17 % ethylene diamine tetra acetic acid (EDTA) and group P: 25 % polyacrylic acid (PAA). Lithium disilicate glass ceramic (e.max CAD) blocks were cemented to conditioned dentin surfaces with self-adhesive cements (RelyX Unicem or Clearfil SA) and photo-polymerized. Specimens were stored in distilled water at 37 °C for 24 h and thermocycled for 6,000 times. The beams were obtained from bonded ceramic–cement–tooth assemblies and were subjected to the MTBS test (1 mm/min). Failure types were analyzed and selected beams were examined under scanning electron microscope. Data (MPa) were analyzed using two-way ANOVA and Tukey’s test (P < 0.05). While cement type significantly affected the MTBS results (P < 0.05), no significant difference was observed between the dentin chelating agents (P = 0.785). Interaction terms were not significant (P = 0.114). Control group with no dentin conditioning presented significantly lower results with both cements (RelyX Unicem: 8.1 ± 1.9a, Clearfil SA: 8 ± 1.6a) than those of conditioned groups (19.3 ± 4.2b–24.5 ± 5.2b) (P < 0.05). Failure types were predominantly adhesive in all groups. Chitosan (2 %), EDTA (17 %) or PAA (25 %) could all be used as dentin chelating agents in conjunction with self-adhesive resin cements tested.

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Conflict of Interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Conservative Dentistry Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt

    Samah Saker

  2. Substitutive Dental Science Department, School of Dentistry, Taibah University, Madinah, Saudi Arabia

    Ahmad Alnazzawi

  3. Dental Materials Unit, Center for Dental and Oral Medicine Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, University of Zürich, Plattenstrasse 11, 8032, Zurich, Switzerland

    Mutlu Özcan

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  1. Samah Saker
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Correspondence to Samah Saker.

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Saker, S., Alnazzawi, A. & Özcan, M. Adhesive strength of self-adhesive resins to lithium disilicate ceramic and dentin: effect of dentin chelating agents. Odontology 104, 53–59 (2016). https://doi.org/10.1007/s10266-014-0180-3

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  • DOI: https://doi.org/10.1007/s10266-014-0180-3

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